Tan C.,Central South University |
Deng H.,RMIT University |
Liu J.,Armored Force Engineering Institute
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011
This paper presents a method for solving the multicriteria group decision making problem in an uncertain linguistic environment. To ensure an effective aggregation of the uncertain linguistic variables in multicriteria group decision making for adequately modeling the uncertainty and imprecision of the decision making process, an uncertain linguistic Choquet integral operator is proposed. A method based on the proposed linguistic Choquet integral operator is developed. An application of the developed method for evaluating the university faculty on promotion is given that shows the developed method is effective for solving the multicriteria group decision making problem in a linguistic environment. © 2011 Springer-Verlag.
Tang D.,Armored Force Engineering Institute
Applied Mechanics and Materials | Year: 2012
Machining distortion analysis and control are the kernel problem in manufacturing industry recently. This paper take face milling as research object, a finite element model for 3D milling process is set up based on some key techniques including cutter feed trajectories representations, cutter tooth-workpiece engagement model etc; Then the optimum LS-SVM model which can express the transitive relationship between cutting parameters and distortion error is set up; The cutting parameters optimization model based on controlling the machining distortion is founded by seeing the optimum LS-SVM model as the main objective function, meanwhile, an effective multi-objective optimization algorithm is proposed by coupling particle swarm algorithm and gray relevancy analysis, this algorithm can change the multi-objective optimization problem into optimizing the gray relevancy value effectively. As an example, the feasibility of proposed machining distortion controlling approach is verified. © (2012) Trans Tech Publications.
Wang R.,Tsinghua University |
Wang B.,Tsinghua University |
Kang J.,Armored Force Engineering Institute |
Liu T.,Tsinghua University
Qinghua Daxue Xuebao/Journal of Tsinghua University | Year: 2010
Measurements of the drill bit attitude during drilling are the key for steering of horizontal directional drilling. An approach was developed to determine the inclination, the azimuth, and the roll using three mutually orthogonal accelerometers and magnetometers. The system includes compensation for the temperature error and the orthogonal error. Error compensation is also included to compensate for the azimuthal error due to the magnetic field interference generated by the drill which affects determination of the geomagnetic inclination and geomagnetic declinations. Test results show that these methods significantly improve the attitude measurement precision.
Feng J.-Y.,Donghua University |
Feng J.-Y.,Quartermaster Research Institute |
Zhang J.-C.,Quartermaster Research Institute |
Zhang H.,Quartermaster Research Institute |
Yang D.-X.,Armored Force Engineering Institute
Advanced Materials Research | Year: 2012
In the commonly used automobile oil filtering materials,having a single layer structure,also having two layer structure and three layer structure,this paper firstly selected four diverse structural filter materials of automobile oil filter cartridge and then discussed their internal structure and property.Putting to use of SEM to analyze their inner construction and research their physical performance and filtration property.The results indicated that the two layer material possesses smaller pore diameter,higher filtration accuracy and better filtration effiency,however,the three layer material is not in the nature of excellent filtration accuracy,therefore,in the process of exploitation of novel filtration material,the target is not to increase it's layer but realizing how to improve the filter efficiency.The monolayer material is mainly the nonwoven and has ordinary filtration effiency.As a result,in the attempt of developing new filtration materials,the aim needs to focus on the two layer new materials,meanwhile,the other objective is to improve the filtration accuracy to nanometer scale.
Ju G.,Armored Force Engineering Institute |
Wu Y.,Qufu Normal University |
Sun W.,Armored Force Engineering Institute
Journal of Systems Science and Complexity | Year: 2011
This paper deals with the stabilization of the nonholonomic systems with strongly nonlinear uncertainties. The objective is to design an output feedback law such that the closed-loop system is globally asymptotically regulated at the origin. The systematic strategy combines the input-state scaling technique with the backstepping technique. A novel switching control strategy based on the output measurement of the first subsystem is employed to make the subsystem far away from the origin. The simulation demonstrates the effectiveness of the proposed controller. © 2011 Institute of Systems Science, Academy of Mathematics and Systems Science, CAS and Springer-Verlag Berlin Heidelberg.